Packed U Cells Multilevel Converter Topology: Theoretical Study and Experimental Validation

Ounejjar, Youssef; Al‐Haddad, Kamal; Grégoire, Luc-André

doi:10.1109/tie.2010.2050412

Cited by 423 publications

(226 citation statements)

References 28 publications

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“…Table II indicates the charging and discharging states of the capacitor. One of the main issues with 7-level PUC inverter in balancing the capacitor voltage is high switching frequency, complexity of the controller and using too many sensors as states variables feedbacks [21,23]. Since the investigated PUC5 inverter has redundant switching states, the capacitor voltage balancing feature can be integrated into the modulation technique.…”

Section: A Puc5 Inverter Configuration and Sensor-less Voltage Balanmentioning

confidence: 99%

“…Packed U-Cell (PUC) inverter has been first introduced by Al-Haddad et al to generate 7-level voltage while using only 6 active switches, one isolated DC sources and one capacitor as second source which its voltage should be controlled to fix at 1/3 of first DC source [20]. Although the mentioned topology has less number of components among other 7-level inverters, it has some major drawbacks including high switching frequency, asymmetric output voltage cycles and levels, requiring fast response and complicated controller with lot of feedback sensors, using large capacitor to regulate the voltage in variable situations and etc [18,21,22].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Sensor-Less Five-Level Packed U-Cell (PUC5) Inverter Operating in Stand-Alone and Grid-Connected Modes

Vahedi

Labbé

Al‐Haddad

2016

IEEE Trans. Ind. Inf.

Self Cite

204

105

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Section: A Puc5 Inverter Configuration and Sensor-less Voltage Balanmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sensor-Less Five-Level Packed U-Cell (PUC5) Inverter Operating in Stand-Alone and Grid-Connected Modes

Vahedi

Labbé

Al‐Haddad

2016

IEEE Trans. Ind. Inf.

Self Cite

204

105

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“…Multilevel inverters can produce high voltage with lower harmonics and lower stress on power switches 1 . The most common multilevel inverter topologies are cascaded H-bridge (CHB), neutral point clamped (NPC), and flying capacitors (FC) [2][3][4] .…”

Section: A New Family Of Multilevel Grid Connected Inverters Based Onmentioning

confidence: 99%

A New Family of Multilevel Grid Connected Inverters Based on Packed U Cell Topology

Pakdel

Jalilzadeh

2017

Sci Rep

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In this paper a novel packed U cell (PUC) based multilevel grid connected inverter is proposed. Unlike the U cell arrangement which consists of two power switches and one capacitor, in the proposed converter topology a lower DC power supply from renewable energy resources such as photovoltaic arrays (PV) is used as a base power source. The proposed topology offers higher efficiency and lower cost using a small number of power switches and a lower DC power source which is supplied from renewable energy resources. Other capacitor voltages are extracted from the base lower DC power source using isolated DC-DC power converters. The operation principle of proposed transformerless multilevel grid connected inverter is analyzed theoretically. Operation of the proposed multilevel grid connected inverter is verified through simulation studies. An experimental prototype using STM32F407 discovery controller board is performed to verify the simulation results.Multilevel inverters are the most suitable solution for grid connection of renewable energy resources such as photovoltaic arrays (PV) or wind turbines. Multilevel inverters can produce high voltage with lower harmonics and lower stress on power switches 1 . The most common multilevel inverter topologies are cascaded H-bridge (CHB), neutral point clamped (NPC), and flying capacitors (FC) 2-4 . Packed U cells (PUC) are recent developed multilevel inverters with reduced number of capacitors and power devices [5][6][7][8][9][10] . The PUC topology needs only one high voltage DC power supply and the lower voltage levels are automatically generated with switching operation in packed U cell capacitors. However, the CHB inverter requires many DC power sources 11 . With equal number of voltage levels, the PUC inverter requires half of power supplies and one third of capacitors compared with FC topology 12 . Furthermore, in the PUC inverter the zero voltage level in freewheeling period can be achieved without using extra power switches. Therefore, the common mode voltage (CMV) will be zero in freewheeling period; as a result the ground leakage current will be declined significantly.In this paper a novel PUC based multilevel inverter is proposed. Unlike the PUC topology, a lower DC power supply from renewable energy resources such as photovoltaic arrays (PV) is used as a base power source. In fact, other power sources are extracted from the base lower DC power supply using isolated DC-DC power converters. In this case, the output peak voltage will be the summation of lower DC power supply and individual DC power sources extracted from the base power source via isolated DC-DC power converters. Moreover, the DC source voltages are the integer multiples of the lowest DC power supply. Therefore, in contrast with the PUC topology with a higher DC voltage source, in the proposed multilevel inverter, multiple low voltage DC power supplies are used.Moreover, only a lower DC source and multiple isolated push-pull or forward DC-DC converters can be used instead of a higher DC voltage supp...

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“…The first one is used in parallel with the DC power source (V 1 ). Whereas the second allows, with the use of a control circuit, the generation of a regulated voltage level (V 2 ) which is necessary to produce the exact voltage levels across the load [15]. As can be seen, only six power switches are required for each leg.…”

Section: Fc Derivedmentioning

confidence: 99%

“…As a consequence, cascaded H-bridge, NPC and FLC are the basic and most used multilevel inverters. After that, multitude of derived and hybrid multilevel topologies were introduced [6][7][8][9][10][11][12][13][14][15][16]. However, they still on the shadow of the major multilevel configurations previously stated.…”

Section: Introductionmentioning

confidence: 99%

Multilevel Inverters Power Topologies and Voltage Quality: A Literature Review

Rehaoulia¹,

Rehaoulia²,

Fnaiech³

2016

Journal of Magnetics

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Due to their performances and inherent benefits, especially in medium-voltage and high-power applications, multilevel inverters have received an increasing attention in real world industrial applications. The present paper deals with a review of the main multilevel inverter topologies as well their most common derived and hybrid structures quoted in previous research works. It also encompasses an investigation on voltage harmonic elimination and THD estimation. For that reason, the paper summarizes the most relevant modulation techniques used so far to enhance the output voltage quality. Theoretical formulas evoked in the literature, for calculating the output voltage THD upper and lower bounds are reported and verified by adequate simulations.

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Packed U Cells Multilevel Converter Topology: Theoretical Study and Experimental Validation

Cited by 423 publications

References 28 publications

Sensor-Less Five-Level Packed U-Cell (PUC5) Inverter Operating in Stand-Alone and Grid-Connected Modes

Sensor-Less Five-Level Packed U-Cell (PUC5) Inverter Operating in Stand-Alone and Grid-Connected Modes

A New Family of Multilevel Grid Connected Inverters Based on Packed U Cell Topology

Multilevel Inverters Power Topologies and Voltage Quality: A Literature Review

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